Over-voltage protection device for resonant wireless power transmission device and method for controlling the over-voltage protection device

Abstract

Provided is an over-voltage protection device for a resonant wireless power transmission device. The over-voltage protection device includes an amplifier for amplifying a transmission signal, a resonance signal generator for generating a wireless resonance signal according to the transmission signal amplified by the amplifier, a voltage detector for sensing a voltage of the wireless resonance signal generated by the resonance signal generator, and a controller for monitoring the voltage detected by the voltage detector to determine whether the voltage repetitively increases and decreases with periodicity when the voltage is greater than a reference voltage and controlling the amplifier to decrease an output of the transmission device by a value according to a result of the determination.

What is claimed is: 
     
       1. An over-voltage protection device for a resonant wireless power transmission device, the over-voltage protection device comprising:
 an amplifier for amplifying a transmission signal; 
 a resonance signal generator for generating a wireless resonance signal according to the transmission signal amplified by the amplifier; 
 a voltage detector for sensing a voltage of the wireless resonance signal generated by the resonance signal generator; and 
 a controller for monitoring the voltage detected by the voltage detector to determine whether the voltage repetitively increases and decreases with periodicity when the voltage is greater than a reference voltage and when it is determined that the voltage is greater than a reference voltage and it is determined that the voltage of the resonance stage repetitively increases and decreases at a predetermined interval, controlling the amplifier to decrease an output of the transmission device by a value. 
 
     
     
       2. The over-voltage protection device of  claim 1 , wherein the periodicity of the voltage detected by the voltage detector is 500 microseconds (μS)-2 milliseconds (mS). 
     
     
       3. The over-voltage protection device of  claim 1 , wherein the amplifier is controlled to decrease the output of the transmission device by at least 30%. 
     
     
       4. The over-voltage protection device of  claim 2 , wherein the amplifier is controlled to decrease the output of the transmission device by at least 30%. 
     
     
       5. The over-voltage protection device of  claim 1 , wherein the amplifier is controlled to shut down the output of the transmission device during a preset period. 
     
     
       6. The over-voltage protection device of  claim 2 , wherein the amplifier is controlled to shut down the output of the transmission device during a preset period. 
     
     
       7. An over-voltage protection method of an over-voltage protection device for a resonant wireless power transmission device, the over-voltage protection method comprising:
 monitoring a voltage of a wireless resonance signal of a resonance stage; 
 determining whether the voltage of the resonance stage, when the voltage is greater than a reference voltage, repetitively increases and decreases with periodicity; and 
 when it is determined that the voltage is greater than a reference voltage and it is determined that the voltage of the resonance stage repetitively increases and decreases at a pre-determined interval, decreasing an output of the transmission device by a value. 
 
     
     
       8. The over-voltage protection method of  claim 7 , wherein the periodicity of the voltage of the resonance stage is 500 microseconds (μS)-2 milliseconds (mS). 
     
     
       9. The over-voltage protection method of  claim 7 , wherein decreasing the output of the transmission device by the preset value comprises decreasing the output of the transmission device by at least 30%. 
     
     
       10. The over-voltage protection method of  claim 8 , wherein decreasing the output of the transmission device by the preset value comprises decreasing the output of the transmission device by at least 30%. 
     
     
       11. The over-voltage protection method of  claim 7 , wherein decreasing the output of the transmission device by the preset value comprises shutting down the output of the transmission device during a period. 
     
     
       12. The over-voltage protection method of  claim 8 , wherein decreasing the output of the transmission device by the preset value comprises shutting down the output of the transmission device during a period.